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A post-modification strategy to precisely construct dual-atom sites for oxygen reduction electrocatalysis

Journal of Energy Chemistry 2024年第3期90卷 511-517,I0012页

作者： Juan Wang Xinyan liu Chang-Xin Zhao Yun-Wei Song jia-ning liu Xi-Yao Li Chen-Xi Bi Xin Wan jianglan Shui Hong-Jie Peng Bo-Quan Li jia-Qi Huang School of Materials Science and Engineering Beijing Institute of TechnologyBeijing 100081China Advanced Research Institute of Multidisciplinary Science Beijing Institute of TechnologyBeijing 100081China Beijing Key Laboratory of Green Chemical Reaction Engineering and Technology Department of Chemical EngineeringTsinghua UniversityBeijing 100084China Institute of Fundamental and Frontier Sciences University of Electronic Science and Technology of ChinaChengdu 611731SichuanChina School of Materials Science and Engineering Beihang UniversityBeijing 100191China

Dual-atom catalysts(DACs) afford promising potential for oxygen reduction electrocatalysis due to their high atomic efficiency and high intrinsic ***,precise construction of dual-atom sites remains a *** this work,a post-modification strategy is proposed to precisely fabricate DACs for oxygen reduction ***,a secondary metal precursor is introduced to the primary single-atom sites to introduce direct metal-metal interaction,which ensures the formation of desired atom pair structure during the subsequent pyrolysis process and allows for successful construction of *** as-prepared FeCo-NC DAC exhibits superior oxygen reduction electrocatalytic activity with a half-wave potential of 0,91 V *** hydrogen ***-air batteries equipped with the FeCo-NC DAC demonstrate higher peak power density than those with the Pt/C *** importantly,this post-modification strategy is demonstrated universal to achieve a variety of dual-atom *** work presents an effective synthesis methodology for precise construction of catalytic materials and propels their applications in energy-related devices.

关键词： Dual-atom catalysts Electrocatalysis Oxygen reduction reaction Post-modification Zinc–air batteries

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Numerical investigation of the dynamics of flexible vegetations in turbulent open-channel flows

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Journal of Hydrodynamics 2022年第4期34卷 681-699页

作者： Dong Xu jia-ning liu Yun-feng Wu Chun-ning Ji State Key Laboratory of Hydraulic Engineering Simulation and Safety Tianjin UniversityTianjin 300072China

Aquatic vegetations widely exist in natural rivers and play an essential role in the evolution of the water environment and ecosystem by changing the river’s hydrodynamic characteristics and transporting sediments and *** reality,most aquatic vegetations are highly flexible,which invalidates the“rigid-cylinder”assumption widely adopted in many *** explore the dynamics of submerged flexible vegetation in open-channel flows and its feedback to turbulent flow structures,numerical simulations are carried out using an in-house fluid-structure interaction(FSI)*** the simulations,the geometry of vegetation plants is grid-resolved,the turbulent flow is simulated using the large eddy simulation(LES),the dynamics of the flexible plants are solved using the vector form intrinsic finite element(VFIFE)method,and the turbulent flow and the plants are two-way coupled using the immersed boundary(IB)*** dynamic responses of the flexible vegetation with different plant flexibility,spacing,and submergence are *** results show that flexible plants are subjected to complex flow-induced vibrations(FIVs)rather than static *** FIV involves both streamwise and cross-flow motions driven by the small-scale vortex shedding around the plants and the large-scale Kelvin-Helmholtz(K-H)vortices developed in the vegetation canopy *** vegetations exhibit pulsive wave motion of different patterns in relatively long and narrow open *** with the open-channel flows with static plants with equivalent bending deformation,the dynamic responses of flexible plants may increase the turbulent Reynolds stress of the open-channel flow by 70%–100%and increase the invasion depth of the K-H vortices by 30%–50%.

关键词： Flexible vegetation dynamic responses flow-induced vibration(FIV) fluid-structure interaction(FSI)

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Transition metal coordinated framework porphyrin for electrocatalytic oxygen reduction

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Chinese Chemical Letters 2019年第4期30卷 911-914页

作者： Chang-Xin Zhao Bo-Quan Li jia-ning liu jia-Qi Huang Qiang Zhang Beijing Key Laboratory of Green Chemical Reaction Engineering and Technology Department of Chemical Engineering Tsinghua University Advanced Research Institute of Multidisciplinary Science Beijing Institute of Technology

Oxygen reduction reaction(ORR) constitutes the core process of many clean and sustainable energy systems including fuel cells and metal–air batteries. Developing high-performance and cost-efficiency ORR electrocatalysts is of great significance to the practical applications of the above-mentioned energy storage devices. Transition metal coordinated porphyrin electrocatalysts are highly considered as a promising substitution of noble-metal-based electrocatalyst because of their high ORR reactivity, where the ORR performances of the porphyrin-based electrocatalysts are highly dependent on the transition metal center. Herein a series of framework porphyrin electrocatalysts coordinated with different transition metal centers(M-POF, where M is Mn, Fe, Co, Ni, Cu, or Zn) was designed, synthesized, and evaluated in regards of electrocatalytic ORR performances. Among all, the Co-POF electrocatalyst exhibits the best ORR performances with the highest half-wave potential of 0.81 V vs. RHE and the lowest Tafel slope of 53 mV/dec. This contribution affords an optimized high-performance ORR electrocatalyst and provides instructions for further rational design of porphyrin-based ORR electrocatalysts for sustainable energy applications.

关键词： Electrocatalysis Oxygen reduction reaction Transition metal coordination Framework porphyrin Fuel cells

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Composing atomic transition metal sites for high-performance bifunctional oxygen electrocatalysis in rechargeable zinc-air batteries

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颗粒学报:英文版 2023年第6期77卷 146-152页

作者： Juan Wang Chang-Xin Zhao jia-ning liu Ding Ren Xinzhi Ma Bo-Quan Li jia-Qi Huang Qiang Zhan School of Materials Science and Engineering Beijing Institute of TechnologyBeijing100081China Advanced Research Institute of Multidisciplinary Science Beijing Institute of TechnologyBeijing100081China Beijing Key Laboratory of Green Chemical Reaction Engineering and Technology Department of Chemical EngineeringTsinghua UniversityBeijing100084China Key Laboratory for Photonic and Electronic Bandgap Materials Ministry of EducationSchool of Physics and Electronic EngineeringHarbin Normal UniversityHarbin150025China

Rechargeable zinc-air batteries have attracted extensive attention as clean,safe,and high-efficient en-ergy storage ***,the oxygen redox reactions at cathode are highly sluggish in kinetics and severely limit the actual battery *** transition metal sites demonstrate high electro-catalytic activity towards respective oxygen reduction and evolution,while high bifunctional electro-catalytic activity is seldomly *** a strategy of composing atomic transition metal sites is proposed to fabricate high active bifunctional oxygen electrocatalysts and high-performance recharge-able zinc-air ***,atomic Fe and Ni sites are composed based on their respective high electrocatalytic activity on oxygen reduction and *** composite electrocatalyst demonstrates high bifunctional electrocatalytic activity(ΔE=0.72 V)and exceeds noble-metal-based Pt/C+Ir/C(ΔE=0.79 V).Accordingly,rechargeable zinc-air batteries with the composite electrocatalyst realize over 100 stable cycles at 25 mA *** work affords an effective strategy to fabricate bifunctional oxygen electrocatalysts for high-performance rechargeable zinc-air batteries.

关键词： Rechargeable zinc-air batteries Bifunctional oxygen electrocatalysis Noble-metal-free electrocatalysts Oxygen reduction reaction Oxygen evolution reaction

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Seawater-based electrolyte for Zinc–air batteries

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Green Chemical Engineering 2020年第2期1卷 117-123页

作者： jia Yu Chang-Xin Zhao jia-ning liu Bo-Quan Li Cheng Tang Qiang Zhang Beijing Key Laboratory of Green Chemical Reaction Engineering and Technology Department of Chemical EngineeringTsinghua UniversityBeijing100084China Advanced Research Institute of Multidisciplinary Science Beijing Institute of TechnologyBeijing100081China School of Materials Science and Engineering Beijing Institute of TechnologyBeijing100081China School of Chemical Engineering and Advanced Materials The University of AdelaideAdelaideSA5005Australia

Aqueous zinc–air batteries(ZABs)are highly regarded as a promising electrochemical energy storage device owing to high energy density,low cost,and intrinsic *** employment of seawater to replace the currently used deionized water in electrolyte will bring great economic benefits and broaden the application occasions of ***,ZABs using seawater-based electrolyte remain uninvestigated without an applicable cathode electrocatalyst or a successful battery ***,seawater-based electrolyte is successfully employed in ZABs with satisfactory *** influence of chloride anions on the cathode electrocatalytic reactivity and battery performance is systemically *** noble-metal-based and noble-metal-free electrocatalysts are applicable to the chloride-containing alkaline *** evaluation of ZABs with seawaterbased electrolyte demonstrates comparable battery performances with the conventional electrolyte in terms of polarization,capacity,and rate *** study demonstrates a successful prototype of seawater-based ZABs and enlightens the utilization of natural resources for clean and sustainable energy storag.

关键词： Zinc-air batteries Seawater-based electrolytes Oxygen reduction reaction Electrocatalysis

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Quantitative kinetic analysis on oxygen reduction reaction:A perspective

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Nano Materials Science 2021年第3期3卷 313-318页

作者： Juan Wang Chang-Xin Zhao jia-ning liu Ding Ren Bo-Quan Li jia-Qi Huang Qiang Zhang School of Materials Science and Engineering Beijing Institute of TechnologyBeijing100081China Advanced Research Institute of Multidisciplinary Science Beijing Institute of TechnologyBeijing100081China Beijing Key Laboratory of Green Chemical Reaction Engineering and Technology Department of Chemical EngineeringTsinghua UniversityBeijing100084China

Oxygen reduction reaction(ORR)constitutes the core process of many energy storage and conversion devices including metal–air batteries and fuel ***,the kinetics of ORR is very sluggish and thus highperformance ORR electrocatalysts are highly *** recent progress on minimizing the ORR halfwave potential as the current evaluation indicator,in-depth quantitative kinetic analysis on overall ORR electrocatalytic performance remains insufficiently *** this paper,a quantitative kinetic analysis method is proposed to afford decoupled kinetic information from linear sweep voltammetry profiles on the basis of the Koutecky–Levich *** parameters regarding exchange current density,electron transfer number,and electrochemical active surface area can be respectively determined following the proposed *** quantitative kinetic analysis method is expected to promote understanding of the electrocatalytic effect and point out further optimization direction for ORR electrocatalysis.

关键词： Oxygen reduction reaction Electrocatalysis Quantitative kinetic analysis Koutecky–Levich equation Mass transfer

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Regeneration of single-atom catalysts deactivated under acid oxygen reduction reaction conditions

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Journal of Energy Chemistry 2022年第10期31卷 478-484,I0012页

作者： Chang-Xin Zhao Ding Ren Juan Wang jia-ning liu Cheng Tang Xiao Chen Bo-Quan Li Qiang Zhang Beijing Key Laboratory of Green Chemical Reaction Engineering and Technology Department of Chemical EngineeringTsinghua UniversityBeijing 100084China School of Materials Science and Engineering Beijing Institute of TechnologyBeijing 100081China Advanced Research Institute of Multidisciplinary Science Beijing Institute of TechnologyBeijing 100081China School of Chemical Engineering and Advanced Materials The University of AdelaideAdelaideSA 5005Australia

Single-atom catalysts serve as a promising candidate to realize noble-metal-free electrocatalytic oxygen reduction in acid ***,their poor stability under working conditions strictly restrains their practical ***,regeneration of their electrocatalytic activity is of great ***,the regeneration of a Fe-N-C single-atom catalyst is demonstrated to be feasible by a facile annealing regeneration *** activity after regeneration recovers to that of the pristine electrocatalyst and surpasses the deactivated *** regeneration mechanism is identified to be selfetching of the surface carbon layer and consequent exposure of the previously buried single-atom ***,the regeneration strategy is applicable to other single-atom *** work demonstrates the feasibility of regenerating oxygen reduction electrocatalysts and affords a pioneering approach to deal with rapid deactivation under working conditions.

关键词： Oxygen reduction reaction Single-atom catalysts Energy electrocatalysis Noble metal free Catalyst regeneration

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Optically-controlled resistive switching effects of CdS nanowire memtransistor

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Chinese Physics B 2021年第11期30卷 449-454页

作者： jia-ning liu Feng-Xiang Chen Wen Deng Xue-Ling Yu Li-Sheng School of Science Wuhan University of TechnologyWuhan 430070China

Since it was proposed,memtransistors have been a leading candidate with powerful capabilities in the field of neural morphological networks.A memtransistor is an emerging structure combining the concepts of a memristor and a field-effect transistor with low-dimensional materials,so that both optical excitation and electrical stimuli can be used to modulate the memristive characteristics,which make it a promising multi-terminal hybrid device for synaptic *** this paper,a single CdS nanowire memtransistor has been constructed by the micromechanical exfoliation and alignment lithography *** is found that the CdS memtransistor has good non-volatile bipolar memristive characteristics,and the corresponding switching ratio is as high as 10^(6) in the *** under illumination,the behavior of the CdS memtransistor is similar to that of a transistor or a memristor depending on the incident wavelengths,and the memristive switching ratio varies in the range of 10 to 10^(5) with the increase of the incident wavelength in the visible light *** addition,the optical power is also found to affect the memristive characteristics of the *** of these can be attributed to the modulation of the potential barrier by abundant surface states of nanowires and the illumination influences on the carrier concentrations in nanowires.

关键词： CdS nanowire memtransistors optically-controlled resistive switching

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High-sensitive phototransistor based on vertical HfSe_(2)/MoS_(2) heterostructure with broad-spectral response

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Chinese Physics B 2022年第12期31卷 662-669页

作者： Wen Deng Li-Sheng Wang jia-ning liu Tao Xiang Feng-Xiang Chen Department of Physics Science and Technology School of ScienceWuhan University of TechnologyWuhan 430070China

Van der Waals heterostructures based on the two-dimensional(2D)semiconductor materials have attracted increasing attention due to their attractive *** this work,we demonstrate a high-sensitive back-gated phototransistor based on the vertical HfSe_(2)/MoS_(2)heterostructure with a broad-spectral response from near-ultraviolet to near-infrared and an efficient gate tunability for *** bias,the phototransistor exhibits high responsivity of up to 1.42×103A/W,and ultrahigh specific detectivity of up to 1.39×1015cm·Hz^(1/2)·W^(-1).Moreover,it can also operate under zero bias with remarkable responsivity of 10.2 A/W,relatively high specific detectivity of 1.43×1014cm·Hz^(1/2)·W^(-1),ultralow dark current of 1.22 f A,and high on/off ratio of above *** results should be attributed to the fact that the vertical HfSe_(2)/MoS_(2)heterostructure not only improves the broadband photoresponse of the phototransistor but also greatly enhances its ***,the heterostructure provides a promising candidate for next generation high performance phototransistors.

关键词： HfSe_(2)/MoS_(2)heterostructure phototransistor high-sensitive broad-spectral response

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Response characteristics of PWR primary circuit under SBLOCAs considering steam bypass discharging

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Nuclear Science and Techniques 2024年第6期35卷 189-201页

作者： Shuai Yang Xiang-Bin Li Yu-Sheng liu jia-ning Xu De-Chen Zhang School of Nuclear Science and Engineering North China Electric Power UniversityBeijing 102206China Beijing Key Laboratory of Passive Safety Technology for Nuclear Energy Beijing 102206China Nuclear and Radiation Safety Center MEPBeijing 100084China

Small-break superposed station blackout(SBO)accidents are the basic design accidents of nuclear power *** the condition of a small break in the cold leg,SBO further increases the severity of the accident,and the steam bypass discharg-ing system(GCT)in the second circuit can play an important role in guaranteeing core *** explore the influence of the GCT on the thermal-hydraulic characteristics of the primary circuit,RELAP5 software was used to establish a numerical model based on a typical pressurized water reactor nuclear power *** different small breaks in the cold-leg super-posed SBO were selected,and the impact of the GCT operation on the transient response characteristics of the primary and secondary circuit systems was *** results show that the GCT plays an indispensable role in core heat removal during an accident;otherwise,core safety cannot be *** GCT was used in conjunction with the primary safety injection system during the placement *** the break diameter was greater than a certain critical value,the core cooling rate could not be guaranteed to be less than 100 K/h;however,the core remained in a safe state.

关键词： Steam bypass discharging Pressurized water reactor SBLOCA Numerical simulation

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